Check your backup save files
Copy-paste everything in another folder before anything else.
Then delete “game.db” which is your current save file.
Rename any “game_backup_XX.db” to “game.db”, launch the game, check the state of things in that backup file 
Try to find the most recent backup file where your thralls still exist, and if that doesn’t work then it’s a bug due to the update and no backup will bring them back.
Good luck.
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